CR4® - The Engineer's Place for News and Discussion®


Previous in Forum: Need Advice as a New Instrument Technician   Next in Forum: Wake Frequency
Close
Close
Close
5 comments
Active Contributor

Join Date: Jan 2017
Posts: 16

Radar Type Level Transmitter

07/29/2017 7:14 AM

Hello,

I am getting confused in case of selecting Non guided radar transmitter.Please note my process is turbulence and there will be vapor&condensation.Now one of my vendor recommended me a xmtr with above 75 GHz,while another one suggest me with frequency below 10GHz. So far i know frequency has an impact on antenna size, beam angle and thus beam width.But does it has any impact on process condition?More clearly please guys make me clear about the application of high and low frequency radar level transmitter

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
Guru

Join Date: Apr 2010
Posts: 5817
Good Answers: 589
#1

Re: Radar Type Level Transmitter

07/29/2017 8:21 AM

The wavelength of 10 GHz is a little over an inch, whereas 75 GHz is a little over 1/8 of an inch. The latter would have a higher resolution as well as smaller components. The beam size is a function of wavelength to antenna size ratio.

Register to Reply
Active Contributor

Join Date: Jan 2017
Posts: 16
#4
In reply to #1

Re: Radar Type Level Transmitter

08/01/2017 2:48 AM

Thanks Rixter for your response,

Actually i am much more concern about the process condition rather than antenna size or installation facilities.As i can fabricate those accordingly.Some articles and and supplier suggesting using frequency range in between 10 to 25GHz,for the above described process.Lower and mid range frequency does not absorbed much in the liquid due to higher wavelength.And it also disperse lesser by the ripple of turbulence.But some of the vendor using high frequency.Now can you please let me know what is typical operating frequency for such kind process as i am new in this field.I will also talk about this later with the supplier.

Thank you again

Register to Reply
2
Commentator
Venezuela - Member - New Member

Join Date: Aug 2010
Location: Venezuela
Posts: 91
Good Answers: 6
#2

Re: Radar Type Level Transmitter

07/29/2017 6:50 PM

Mahmud,

Read this article

https://www.flowcontrolnetwork.com/selecting-the-right-frequency-for-radar-level-measurement/

Regards

JP

__________________
Instruments-guy-SAV
Register to Reply Good Answer (Score 2)
Power-User

Join Date: Jul 2016
Posts: 375
Good Answers: 20
#3
In reply to #2

Re: Radar Type Level Transmitter

07/31/2017 2:15 PM

As an extension of going low for the frequency, I have the current history of some ultrasonic instruments installed and operating continuously since 1996 installed in tanks, some with 2-3 inches of foam, 150F liquid, vented, large water drops on the 3" diameter face, not a problem. The 2" pipes crossing within the 12 degree cone did cause trouble. Newer versions of this Canadian built instrument are even more versatile. The accuracy may not be as high as the higher frequency instruments, but lots more forgiving of process environment & general cleanliness, inside & out.

Much more reliable is head pressure sensing, 3" to 4" flush diaphragm, if you have a port low on the tank. Surface vapor, dirt, foam, ignored. The tank bottom has to be badly fouled to affect the reading, temperature corrected if necessary, just like ultrasonic/radar generally requires.

Register to Reply
Active Contributor

Join Date: Jan 2017
Posts: 16
#5
In reply to #2

Re: Radar Type Level Transmitter

08/01/2017 2:50 AM

thank you, this article was helpful.

Register to Reply
Register to Reply 5 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
Copy to Clipboard

Users who posted comments:

Instruments-guy-SAV (1); Mahmud Reza (2); Rixter (1); rwilliams (1)

Previous in Forum: Need Advice as a New Instrument Technician   Next in Forum: Wake Frequency

Advertisement